feat: add web public assets and robots config

apps/web/public/_robots.txt

@@ -0,0 +1,3 @@
+User-agent: *
+Allow: /
+Sitemap: https://trawl.dev/sitemap.xml

apps/web/public/favicon.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
+  <rect width="32" height="32" fill="#080808" />
+  <rect x="6" y="8" width="20" height="3" fill="#00e87a" />
+  <rect x="14" y="8" width="4" height="15" fill="#00e87a" />
+</svg>

apps/web/public/sitemap.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+  <url>
+    <loc>https://trawl.dev/</loc>
+    <changefreq>weekly</changefreq>
+    <priority>1.0</priority>
+  </url>
+</urlset>